I don't get why you have to be a cookie cutter size for La Senza. I mean, it's their business. They can run it however they want.... but really? More sizes, at least online = more customer base. Accept returns in store for online products.
Parker, Fredericks does a semi-annual clearance sale in July and right after Christmas, like a late Boxing Day sale. Sometimes you can get their bras for $12. In my experience, though, the lace ones don't look as good in person. They still look okay and they fit well, but not as good. I personally hate underwire and hate wearing them, so their extreme Hollywood bra and I don't get along, but the majority of their bras are comfortable enough for a long day. I bought one of those satin bras and it's very pretty and supportive.